Transformation strengthened cold-machined high-strength steel, steel tube and manufacturing method thereof

A phase transformation strengthening, high strength steel technology, applied in the field of cold drawn/cold rolled high strength steel, phase transformation strengthened cold processed high strength steel, steel pipe and steel pipe manufacturing, it can solve the problems of high strength steel pipe and other problems, and achieve production Low cost, significant phase transformation strengthening and strain strengthening, and the effect of ensuring production efficiency

Active Publication Date: 2016-10-26
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high-frequency induction heating and quenching, only automobile anti-collision pipes with a maximum wall thickness of 2.5mm ca

Method used

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  • Transformation strengthened cold-machined high-strength steel, steel tube and manufacturing method thereof
  • Transformation strengthened cold-machined high-strength steel, steel tube and manufacturing method thereof
  • Transformation strengthened cold-machined high-strength steel, steel tube and manufacturing method thereof

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0054] Table 1 shows the composition of the steel of the embodiment of the present invention and the comparative example, Table 2 shows the manufacturing process of the steel pipe of the embodiment of the present invention and the comparative example, and Table 3 shows the mechanical properties of the steel pipe of the embodiment of the present invention and the comparative example.

[0055] The manufacturing process of the embodiment of the present invention includes the following steps, and the specific process parameters are shown in Table 2:

[0056] (1) Smelting and casting into tube blanks according to the chemical element mass percentage distribution ratio shown in Table 1;

[0057] (2) Heat the tube billet to 1200-1260°C in an annular heating furnace, and soak for 30-90 minutes;

[0058] (3) Use a vertical conical hot piercer for hot piercing, ...

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Abstract

The invention provides a transformation strengthened cold-machined high-strength steel, a steel tube and a manufacturing method thereof. The steel comprises the following chemical components in percentages by weight: 0.11-0.17% of C, 0.1-0.5% of Si, 0.5-2.0% of Mn, 0.01-0.05% of Al, 0.001-0.01% of Ca, less than or equal to 0.015% of P, less than or equal to 0.003% of O, less than or equal to 0.005% of S, less than or equal to 0.004% of N, and the balance of Fe and inevitable impurities, and meanwhile, the following relationship is required to be satisfied: 0.3%<C*Mn+Cr+2Mo<1.1%. The cold-machined high-strength steel tube is prepared by a transformation strengthened and strain strengthened composite process, the yield strength of the steel tube reaches 890 MPa or above, the elongation is greater than or equal to 10%, the structure of the steel tube is deformation ferrite and tempered martensite, and damping performance is excellent.

Description

technical field [0001] The present invention relates to high-strength steel pipes, in particular to a phase-transition-strengthened cold-worked high-strength steel, a steel pipe and a method for manufacturing a steel pipe, in particular to cold-drawn / cold-rolled high-strength steel with a yield strength of 890 MPa or more produced by a phase-change strengthening process, A steel pipe and a method for manufacturing the steel pipe. Background technique [0002] It is an inevitable trend of social development that construction machinery and steel structures are developing in the direction of large load-bearing and lightweight. Especially for steel structural parts that bear high loads, increasing the strength grade of materials can not only reduce the self-weight of the structure, reduce material costs, but also help improve the bearing capacity of steel structural parts. Therefore, how to increase the strength of steel at low cost and efficiently has always been the goal purs...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/18C22C38/08C22C38/16C22C38/06C21D8/10
CPCC21D8/105C21D2211/005C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 田青超万化忠
Owner BAOSHAN IRON & STEEL CO LTD
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